Never give in, never give in, never, never, never, never - in nothing, great or small, large or petty - never give in except to convictions of honor and good sense. See Shakespear, King Lear, Act V, scene iii. and William Pitt, Earl of Chatham, "Never . . . Lay Down Arms"
I think "No comment" is a splendid expression. I am using it again and again. I got it from Sumner Welles. To reporters at the Washington airport, after conferring with President Truman at the White House, February 12, 1946